Punch press



Aug. 10 1926. y 1,595,678

J. T. MURPHY PUNCH PRESS Filed June 30, 1925 3 sheets-Sheet 1 Q Q www! vz 4 j c]- 71 M'tplyO/I- 1% N "hf-7 L9-7,- www J. T. MURPHY PUNCH PRESS Filed June 30, 1925 3 sheets-Sheet 2 T. M11/17C) A-ug. 10, 1926.

3 Sheets-Sheet 45 J. T. MURPHY PUNCH PRESS Filed June 30', 1925 Feterrted .dirige 1d,

USEH T'. MURPHY, 0F S'BCUSE, NEW YORK runen russe.,

Application tilt-: 1 Time S15, 1925. Serial No. 40,60*?.

This invention reletes to machines for formingr openings in ,the sides of u sheet metal cup or cylinder. und the object of the invention is to provide e compiict,v easily o ereted end eihcieut device' whereby it 'oliirality of openings I -iay be formed in such u sheet metal structure simultaneously so that it will be unnecessary to shift the cylinder to 'permit thetormation ot the openings, thereby expediting the'ivorl and reducing the cost or production. One einbodiment of my invention is illustrzited in 'the eccompenyingf trainings and the invention resides in cert-ein novel features which will be hereinafter tirst fully described and then more particularly pointed out in the appended claims.

ln 'the drawings:

Figure l is an elevation et the operating portion ot my improved press;

Fig. 2 is :i 'pluri view ot the stand or bench upon which the Working elements are mounted Fig. entire l; -perts e is a verticali section ol 'the apparatus upon the line 3-3 of;4

l is a view ot the working rith-the fece plete removed;

5 is u. detail ot one of the blocks which constitute guides tor the plungers; Fig. 6 is e detail section on the line (Sw-ti of Fig. 11, and

'i' end- 8 ure detail views showing diierent forms ot punches or movable dies.

lin carrying:r out my invention., l employ e bench' or support for the punching mochiliiism which consistsof e top 1 and legs 2, upon the-upper ends ot' which the top l is firmly secured, the legs 2 being' braced by one or 4more cross bars 3 and being preterably connected at their upper ends by an integral treme, indicated et. The top 1 preferebly e substantiel metal plate bolted et its corners upon the freine d and provide-d st oppositesides ot its transverse center with longitudinally extending slots 5 t'or e, purpose which will presently appear. lu rear o'if the rear .legs 2 is erected a stunderd e which luis .its upper end portieri arched to curry e bearing 7 for e driving shaft vtl, coupling bers 9 being 'interposed between seid standard and the rear legs 2- and rigidly secured to the seine` es will be understood. upon reference to Fig. 3. vvThe shaft has loosely mounted thereon e pulley '10 over which e belt 11 is trained whereby to operetivelycouneot thepulley with any loose clutch member will be transmitted to the clutch member 12 and thence to the shzi'ift` es will be understood. The clutch may be of any preferred form, and I have illustrated conventionally e friction clutch. The Shiftable clutch member 12 is controlled by un angle lever 13 which is ulcrumed upon a suitable bracket carried by the standard 6 and connected by e connecting rod 1e with the rear end of e foot lever 15 tulcrumed upon the loor of the Workrooin and extending beyond the legs 2 of the stand, es shown in Fig. 3, a retrectile spring 16 being connected to the foot lever and the stand so as to hold the forward end of the lever normally raised and the rlutch normally open.

Secured upon the table top 1 are brackets 1'? which are preferably of the right angular form shown clearly in Figs. 1 und 3, being .secured upon the table top by suitable bolts inserted through the lower web of the brackets and the slots 5 in the top. This ari-:logement permits the brackets to be adjusted more or less from front to rear of the stand or worlr bench so that the Working mechanism will be supportedfin proper relation to the stand` as will be understood. Carried bythe upright webs of these brack ets 17 is a face plete 18 which is secured to the brackets by bolts 19 inserted through the brackets und the fece plete in an obvious manner. rilhis face plete 18 is provided with a central opening 20 through which the work is inserted in the operation of the machine, and disposed upon diameters oi the pluto are slots or radial openingsk 21, four of said openings being shown in the illustrated embodiment of the invention, although it will be understood that any desired number of the openings may be pro` vided as may be desired without involving any departure from the'invention. In rear 'ot' the face plete 18 and in spaced `relation thereto is provided a back plate 22Whioh` is provided with radial openin s .23, corp/f responding 1n number and locution tof openings 21 in theface platen and thisliok' plate 22 is carried by'the same bolts'Y 24'. wheh secure the face plate to the bracket g3' risorgere `17. The back plate is offset at its center, as shown at 25, thereby providing a central recess in which is secured the rear or basal end QG of a mandrel or lined die 27 which projects forwardly through the opening' 20in the 'tace plate and is arranged concentric therewith. The offset 25 of' the hack plate provides a strong support tor theniandrel or stationary die and permits the base ot the niandrel Vto' be secured to the bacl: plate in such position that the front surface of the nase will not project beyond the plane of the front face ot the hack plate, as will he understood upon reference to Fig. 3. Between the tace plate and the hack plate, l provide fillers or guide blocks '28 which are substantially quadrantal in outline and maintain the face plate and the back plate in fixed spaced relation, the fillers being rigidly secured tov and between the vtace plate and the back plate by bolts 29 inserted through registering openings\provided therefor. ners ot the lillers are concave, as shou'nat 30, the radius of the eoncavity being slightly greater than the radius of the opening` 20 in the tace plate. and preferably equal to the radius ofthe base QG of themandrcl or stationary die. Between the concave sun face 3() and the outer convex edge Ill ot the filler. blocks, recesses are formed in cach straight edge of each filler and these re eesses are so located that they `will register vwith the openings 2l in the. 'face plate. and

defining` housings or chanilars to receive cxpansion spr-ings Slidably mounted in the channels delined by the opposed edges oi" adjacent lillers and by the front plate and the bach plate are planners. -l- 'which are {iat-sided so that they will tit easily and closely Within the said channels or passages and `will he preyelited from rotating about their ou'n axes therein. At the inner end the openings Qvin theback plate, thereby ot each plunger secured a die or punch- 35 which may be ot any preferred torni so hat an opening in thc work-ot any desired outline may be made. l have illust ated a punch 3G adapted to forni a circular opening and also a die or punch 37 which is adapted to n'ialie a straight sided openino, but it Willbe understood that vthe particular design of the punch is innnatcrial and they inay be given any design which may be desired. lt will also be understood that the niandrcl or stationary die/27 is proridcd'u'ith opeuings 38 through its walls which correspond in outline tothe outline of the punch. and

it niav also he noted that the mandrel is hollow so that the Waste piecesstruck troni the Work may' collect therein and heeasily drawn therefrom oy hand or hythe use ot any conyenient implement. The-springs 38 preferably' in the torni ot coi-led springs encircling the respcotive piangere, andtliey ing a forwardly projecting rest at their inner ends against the inner ualls ot' the slots 2l and 28 and at their outer ends hear against abutment plates 39 which are fitted upon the respective plungers and held thereto by pins l0 inserted through the plungers at the outer side ot the abutnicnt plates. The springs tend constantly to hold the plungers in retracted position and the parts are so proportioned that the ends ot the punches 36 or B7, as the case may he. n'ill he normally spaced troni the mandrel a sullicicnt distance to permit the and equipped with an anti-rriction roller d3.

vtlc-cured to the front end ot the. shaft S is a head plate 44 and rigidly secured to said head plate. concentric with the Jface plate i8 and the back plate 22. is an actuating l,nieniher consisting ot" a disk Lili hav- 46 which encircles the 'tace plate, the back plat and the plungers and is spaced radial ly therefrom, as clearly shown in the drawings. .it interrals upon the inner circumference ot vthis peripheral rim' LlG are a series ol cani projections 47 which correspond in number and in location to the plungers and the levers connected with the plungers. lllhcu the niachine is at rest, the plungers u'ill be projected outwardly underi'the ,ine iluenre ot the several springs 33 and the rollers i3 atwthe tree ends of the several levers 4l will rest against the inner-*circumference ol' the rnn yat the hase of 'the rcspectivecain projections. lf the rim he caused tot more in the direction indicated by the arrow in Fig. l, the cani projections will obviously ride aiainst the rollers 43 and `torce the tree ends ot the several levers il inwardly thereby causing the several plungers to slide inwardly and carry the dies at their inner ends through the Work and the radial openings 38 in 'the mandrel so that the desired holes will loe made in the n'orl.

itroni the foregoing description, taken in connection with the accompanying drawings, it isthought the operation of the machine -uill be `readily understood lout it may e brietly sunin'iarized. A sheet metal cup or cylinder is inserted over the mandrel 2'?. as

indicated hy the dotted lines in Fig. 3, while the several working parts are at rest and the Worlnnan then exerts pr ssure throneh his toot upon the toot lever l5 so that said lever u'illbe rocledand the connecting rod lst, lifted to roel; thev angle lever 13 and tlierebyrlose tlieclutcli, whereupon the ace peripheral rini i ".uating pressure-applying member consisting of the disk 45 and the rim 46 will be rotated and will carry the cam projections against and past the rollers 43 so that the levers 4l will be rocked and the several plungers driven inwardly to make the desired holes in the work, The pressure upon the foot lever is maintained for a sufficient interval to permit the actuating member to rotate through one-fourth of a revolution sorthat,

when it ,cpines to rest, the several cam projections will be in proper relation to the rocking arms or levers l to again actuate the saine immediately upon the clutch being again closed.` `When the p essure upon the tout lever is released, the spring 16 at once contracts and returns the parts to their initial positions, opening the clutch. It will be noted that I have provided an exceed ingly compact. and simple machine by the use of which openings may be formed in the sides of cylindrical sheet metal devices rapidly and without requiring excessive labor upon the part of the workman. The

actuating member also Y protectthe rocking arms or levers and the plungers are completely housed between the face plate and the back plate so as to be guided thereby, and the liability of any of the parts to be damaged by chance blows i's practically eliminated.

Having claim:

1. In apparatus for the purpose set forth, the com ination of a .tace plate, a back plate concentric with the face plate, the face plate having a central opening therethrough, filleis between the face plate and the buck plate having ltheir Iopposed edges spaced apart, means for securingthe fillers, the face plate and the back plate in lixed relation, means for securing the face plate, the back plate and the fillers to a xed support, a mandrel secured to the back plate at thc center thereof and projecting through the central opening in thelt'ace plate, plungers plate and the forms a housing tov thus described the invention, Iy

slidably mounted between the face plate, the back plate and the fillers, punchescarried by the plungers to cooperate with the mandrel, means for holding the plungers normally from the mandrel, and means for forcing the plungers to the mandrel.

In apparatus for the purpose set forth, the combination of a face plate, a back plate concentric with the face plate and spaced therefrom, fillers secured between theI face back plate andhaving their opposed edges spaced apart, the face and the back plate being provided with registerin openings and the fillers being provided 1n t cesses registering with said openings, lungers slidably mounted between the 1ers, the face plate and the back plate, ex ansiou springs housed in the openings in t e face' plate and the back plate and the recesses in the fillers and encircling the lungers, abutment plates carried bythe p ungers and re# ceiving the outward thrust of the said springs whereby the plungers `will be normally held in their outer positions, and means acting upon the outer ends of the plungers for driving the plungers inwardly.

In apparatus for the purpose set forth, the combination of a fixed support, a inandrel upon the said support at-the center of plete'- 60 heir opposite edges with rethe same, a plurality of radial plungers slidably mounted in the support, means for holding the plungers normally from the mandrel, rocking arms extending across and pi'votally connected between ytheir ends with the outer ends of the respective plungers and each fulcrumed atv one end upon the xeo support, an annular rim encircling the 'xed support and the said rocking arms, means for rotating said rim, and cam projections on the inner circumference of the rim arranged to ride over the free ends of the rocking arms andthereby drive the plungers.

to the mandrel.

In testimony whereof I affix my signature.

` J OSLPHr T. MURPHY. [n s.) 

